Is this your Adobe CC user profile name? I've got the same issue as EditorPete.
I've added MP4's to my CC Library, light leaks,fire etc. I can see all the files in After Effects libraries but 'right-click, add to project' does nothing and if I drag them straight into my comp, it puts a placeholder instead and in my project window the icon of the video has colour bars and a shopping cart to license the video but they're my own.
Adding pictures works fine though?
Also adding the same files with the same method (libraries) in Premiere Pro works perfectly.
Appreciate any help, thanks!